Diversification is the practice of spreading investments across asset classes, sectors, and geographies so that poor performance in one area doesn't devastate your entire portfolio.
How It Works
Different assets react differently to the same economic event. When stocks fall, bonds may rise. By owning both, losses in one are partially offset by gains in the other.
Common Approaches
- Mix of stocks, bonds, and real estate
- Domestic + international exposure
- Large-cap, mid-cap, and small-cap stocks
- Index funds or ETFs for instant diversification
Correlation Is What Actually Reduces Risk
Diversification only works when the assets you hold don't move in lockstep. Owning 20 different tech stocks isn't well diversified because they tend to rise and fall together during sector-wide swings; owning a mix of stocks, bonds, real estate, and cash — asset classes with low or negative correlation to each other — provides real protection.
Diversification Has Limits
During severe market-wide crises (like 2008 or March 2020), correlations across nearly all risk assets tend to spike toward 1 — almost everything falls together. Diversification reduces risk in normal markets; it rarely fully eliminates losses in a systemic crisis.